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Roman55 [17]
3 years ago
10

Can someone help me please. This is the last day

Chemistry
2 answers:
dusya [7]3 years ago
7 0
Answer: Nucleus
Pls give me brainliest.
kotykmax [81]3 years ago
3 0

Answer:

atomic nucleus :)

Explanation:

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A solution contains 45 grams of nitrogen gas and 40 grams of argon. What is the mole fraction of argon in this solution?
Katarina [22]
 <span>0.38 

You first calculate the total moles by dividing the grams by molecular weight: 
45 g N2 / 28.02 g/mol = 1.6 mol N2 
40 g Ar / 39.95 g/mol = 1.0 mol 

Then you divide the moles of Ar by the total number of moles: 
1.0 / (1.6 + 1.0) = 0.38 mol fraction</span>
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3 years ago
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Vesnalui [34]

Answer: It's the circulatory system

Explanation:

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2 years ago
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Which weak acid solution has the greatest percent ionization? which weak acid solution has the greatest percent ionization? 0.14
sweet [91]

Answer:

0.0140 M H₂C₆H₆O₆.

Explanation:

  • We should mention the relation: <em>Ka = α²C,</em>

Where, Ka is the dissociation constant of the acid.

α is the degree of ionization of the acid.

C is the concentration if the acid.

<em>The percent of ionization (α %) = α x 100.</em>

α = √Ka/C

∴ α is inversely proportional to the concentration of the acid.

<em>So, the acid with the lowest concentration has the greatest percent ionization.</em>

5 0
3 years ago
A mole equals 6.02 x 10^23 . Answer these questions below.
siniylev [52]

Answer:

1. 1.25 mol ants x 6.02*10^23 ants/1 mol ants = 7.53*10^23 ants

2. 4.92*10^26 pencils x 1 mol pencils/6.02*10^23 pencils = 817 mol pencils

3. 0.26 mol molecules x 6.02*10^23 molecules/1 mol molecules = 1.6*10^23 molecules

4. 3.46*10^19 molecules x 1 mol molecules/6.02*10^23 molecules = 5.75*10^-5 mol molecules

5. 5.3*10^20 atoms x 1 mol atoms/6.02*10^23 atoms = 8.8 mol atoms

6. 0.11 mol atoms x 6.02*10^23 atoms/1 mol atoms = 6.6*10^22 atoms

I would suggest looking into "dimensional analysis" for help with this type of material. Dimensional analysis will stick with you all throughout chemistry, so picking it up will be extremely beneficial.

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2 years ago
PLEASE HELP I'LL MARK BRAINLIEST TO CORRECT ANSWER!! WORTH 25 POINTS!!
ladessa [460]

Answer:

B

Explanation:

As it goes down the slope/rail, it gains more kinetic energy and at this point its at its highest peak, which decreases as it reaches C then increases once again

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